This may be the only refresh setting that will work for 1024x768. The 50HZ one.

Computers just do strange things sometimes.
After all the setting and resetting of video settings some file could be corrupted or who knows what.

How about start all over fresh and go from there.
If you boot with the Live Puppy CD
At boot screen hit F2 key
use boot option puppy pfix=ram
That will make it boot and not use the save file.
It will boot just like the first time.

You have a very old video card. Driver support may not be 100%. You now have a good idea how to change settings. So start over with this clean fresh run of Puppy.

This hardware may just not work good with this version of Puppy.
May need to use an older version of Puppy.
Puppy 4.3.1 is a good one to start with.
Or others:
Wary
Classic Pup 2.14X
Lucid Puppy 5.1.1

The NVIDIA-Linux-x86-71.86.15-pkg1.run driver you talked about, may be the answer. You will have to run it as I instructed in earlier post._________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

OK. I booted Puppy with "puppy pfix=ram" and did give me a 1024x768@74.55Hz resolution, but it looked like a wrinkled paper.

The problem is driver support for that old a video card.
Monitor native resolution could also be a factor.
Should never run a Monitor higher than it's native resolution.

Was it set to 1024X768 16 or 24?
May make a difference.

Classic Pup 2.14x may work better._________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

This should be the Nvidia driver that is made for your video card. It will run in Puppy 4.3.1 but not in other Puppies._________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

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